Java android位置API:FusedLocationApi.getLastLocation提供空值

我试图使用GoogleAppClient查找设备的最后一个已知位置，所以我使用了精细级别的访问，但由于位置为空，所以出现以下异常

    E/AndroidRuntime: FATAL EXCEPTION: main
        Process: com.example.kuldeep.location2, PID: 1421
            java.lang.NullPointerException: Attempt to invoke virtual method 'double android.location.Location.getLatitude()' on a null object reference
                at com.example.kuldeep.location2.MainActivity.onConnected(MainActivity.java:51)

                private GoogleApiClient mGoogleApiClient;

                @Override
                protected void onCreate(Bundle savedInstanceState) {
                    super.onCreate(savedInstanceState);
                    setContentView(R.layout.activity_main);

                    mGoogleApiClient = new GoogleApiClient.Builder(this)
                        .addConnectionCallbacks(this)
                        .addOnConnectionFailedListener(this)
                        .addApi(LocationServices.API)
                        .build();
                }

                @Override
                protected void onStart() {
                    mGoogleApiClient.connect();
                    super.onStart();
                }

                @Override
                protected void onStop() {
                    mGoogleApiClient.disconnect();
                    super.onStop();
                }

                @Override
                public void onConnected(Bundle bundle) {

                    try {
                        Location mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
                            mGoogleApiClient);
                        Toast.makeText(this, mLastLocation.getLatitude() + ", " + mLastLocation.getLongitude(), Toast.LENGTH_SHORT);
                    } catch (SecurityException e){
                        e.printStackTrace();
                    }
                }

我的清单文件如下：

        <?xml version="1.0" encoding="utf-8"?>
        <manifest xmlns:android="http://schemas.android.com/apk/res/android"
            package="com.example.kuldeep.location2">

            <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
        </manifest>

---

首先，getLastLocation（）可以为null，因此您可以在不进行“null”检查的情况下，小心地直接访问mLastLocation。其次，我建议您在清单中添加：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 

---

首先，getLastLocation（）可以为null，因此您可以在不进行“null”检查的情况下小心地直接访问mLastLocation。其次，我建议您在清单中添加：

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 

---

使用GoogleAppClient查找如下所示的当前位置：

private GoogleApiClient googleApiClient;
private Location mLastLocation;

                @Override
                protected void onCreate(Bundle savedInstanceState) {
                    super.onCreate(savedInstanceState);
                    setContentView(R.layout.activity_main);

                    isCheckLocationServiceisOn(context);

                    if(googleApiClient == null) {
                    googleApiClient = new GoogleApiClient.Builder(this)
                   .addConnectionCallbacks(this)
                   .addOnConnectionFailedListener(this)
                   .addApi(LocationServices.API)
                   .build();
        }

                @Override
                protected void onStart() {
                    mGoogleApiClient.connect();
                    super.onStart();
                }

                @Override
                protected void onStop() {
                    mGoogleApiClient.disconnect();
                    super.onStop();
                }


               @Override
               protected void onResume() {
                  super.onResume();
                  isCheckLocationServiceisOn(context); 
                }

              @Override
              public void onConnected(Bundle arg0) {

             if(googleApiClient.isConnected()) {
              mLastLocation = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);

            if (mLastLocation != null) {
                System.out.println("latiTude....."+ String.valueOf(mLastLocation.getLatitude()));
                System.out.println("longiTude....."+ String.valueOf(mLastLocation.getLongitude()));
            }   
        }
    }

    @Override
    public void onConnectionFailed(ConnectionResult arg0) {
        System.out.println("onConnectionFailed...."+ arg0.toString());
    }


    @Override
    public void onConnectionSuspended(int arg0) {
        System.out.println("onConnectionSuspended...."+ arg0);
    }  

在清单中添加权限：

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 

---

使用GoogleAppClient查找如下所示的当前位置：

private GoogleApiClient googleApiClient;
private Location mLastLocation;

                @Override
                protected void onCreate(Bundle savedInstanceState) {
                    super.onCreate(savedInstanceState);
                    setContentView(R.layout.activity_main);

                    isCheckLocationServiceisOn(context);

                    if(googleApiClient == null) {
                    googleApiClient = new GoogleApiClient.Builder(this)
                   .addConnectionCallbacks(this)
                   .addOnConnectionFailedListener(this)
                   .addApi(LocationServices.API)
                   .build();
        }

                @Override
                protected void onStart() {
                    mGoogleApiClient.connect();
                    super.onStart();
                }

                @Override
                protected void onStop() {
                    mGoogleApiClient.disconnect();
                    super.onStop();
                }


               @Override
               protected void onResume() {
                  super.onResume();
                  isCheckLocationServiceisOn(context); 
                }

              @Override
              public void onConnected(Bundle arg0) {

             if(googleApiClient.isConnected()) {
              mLastLocation = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);

            if (mLastLocation != null) {
                System.out.println("latiTude....."+ String.valueOf(mLastLocation.getLatitude()));
                System.out.println("longiTude....."+ String.valueOf(mLastLocation.getLongitude()));
            }   
        }
    }

    @Override
    public void onConnectionFailed(ConnectionResult arg0) {
        System.out.println("onConnectionFailed...."+ arg0.toString());
    }


    @Override
    public void onConnectionSuspended(int arg0) {
        System.out.println("onConnectionSuspended...."+ arg0);
    }  

在清单中添加权限：

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />